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Subjectcopy_to_user to a kmapped address
Is this (in file_read_actor) bogus or am I missing something?

1621 kaddr = kmap(page);
1622 left = __copy_to_user(desc->buf, kaddr + offset, size);
1623 kunmap(page);

It seems to me that copy_to_user should be able to assume that the destination
address is a user address.

This is biting me because I'm moving the UML kernel into a separate address
space, so there's no way, in general, to tell the difference between a kernel
address and a userspace address.


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